Pullman WA Re-Piping Inspection Checklist: What Homeowners Must Know

If you’re planning a re-piping project in Pullman, Washington, you’re not alone—many homeowners upgrade aging pipes for safety, efficiency, or resale value. But without following the City of Pullman WA re-piping inspection checklist and local plumbing code, your project could stall, fail inspection, or even violate state law. This guide breaks down exactly what you need to know to stay compliant, avoid fines, and ensure your plumbing system passes with flying colors.

What Is the City of Pullman WA Plumbing Code Based On?

The City of Pullman adopts the Washington State Plumbing Code (WSPC), which is based on the Uniform Plumbing Code (UPC) published by the International Association of Plumbing and Mechanical Officials (IAPMO). As of 2024, Pullman enforces the 2021 edition of the WSPC, with local amendments tailored to regional conditions like frost depth and water pressure standards.

According to the Washington State Department of Labor & Industries, over 68% of plumbing inspection failures in small cities like Pullman are due to improper slope, incorrect pipe sizing, or missing backflow protection—issues that are 100% preventable with the right checklist.

💡 Pro Tip: Always verify code updates with the City of Pullman Community Development Department before starting any work. Codes can change mid-year!

Do You Need a Permit for Re-Piping in Pullman, WA?

Yes—absolutely. The City of Pullman requires a plumbing permit for any full or partial re-piping project, including:

• Replacing more than 50% of the existing water supply or drainage system
• Installing new fixtures that require new piping
• Changing pipe material (e.g., switching from galvanized steel to PEX)

Permits cost $125–$275, depending on project scope, and must be obtained before any work begins. Working without a permit can result in:

• Stop-work orders
• Fines up to $500/day
• Mandatory removal of unpermitted work

⚠️ Note: Minor repairs (like fixing a single leaky faucet) typically don’t require a permit—but when in doubt, call Pullman’s Building Division at (509) 338-3534.

Step-by-Step: City of Pullman WA Re-Piping Inspection Checklist

Follow this official checklist to ensure compliance with the City of Pullman WA plumbing code:

1. Submit Plans & Obtain Permit

• Provide a scaled plumbing diagram showing pipe routing, fixture locations, and materials
• Specify pipe types (copper, PEX, CPVC) and diameters
• Include backflow prevention details if connected to irrigation or fire systems

2. Use Approved Materials

Only use materials listed in the 2021 WSPC Chapter 6:

• Water Supply: PEX-A (ASTM F876), Type L copper, or CPVC (Schedule 80)
• Drain-Waste-Vent (DWV): ABS or PVC (Schedule 40), properly glued per manufacturer specs
• All materials must bear NSF/ANSI 61 certification for potable water

3. Install Pipes to Code Specifications

• Slope for DWV pipes: Minimum 1/4 inch per foot (WSPC 707.2)
• Support spacing: Horizontal PEX every 32 inches; copper every 6 feet
• Frost protection: All exterior or unheated-space pipes must be insulated or buried below 24 inches (Pullman’s frost line)

4. Install Required Valves & Vents

• Shut-off valves within 3 feet of every fixture
• Vent pipes must extend through the roof and be ≥6 inches above roof surface (WSPC 904.1)
• Backflow preventers required for hose bibs, irrigation, and boilers

5. Schedule Inspections

Pullman requires two mandatory inspections:

1. Rough-in inspection (before walls are closed)
2. Final inspection (after fixtures are installed and system is pressure-tested)

🔍 Inspection Tip: Call at least 48 hours in advance. Same-day requests are rarely honored.

6. Pass the Pressure Test

• Water supply lines must hold 80 PSI for 2 hours with zero pressure drop
• Document the test with a licensed plumber’s signed affidavit

For visual clarity, here’s a quick-reference table:

Real-World Example: Pullman Re-Piping Fail (and How to Avoid It)

In 2023, a homeowner in Pullman’s Grand Avenue neighborhood failed their final inspection three times because:

1. They used unapproved gray polybutylene pipe (banned in WA since 1995)
2. Vent pipes terminated in the attic (violating WSPC 904.3)
3. No pressure test documentation

After hiring a licensed plumber and re-routing vents to the roof, the project passed on the fourth try—at an extra cost of $2,100.

📌 Lesson: When in doubt, hire a Pullman-licensed plumber. The city maintains a list of approved contractors.

For deeper context on plumbing standards, see the Uniform Plumbing Code overview on Wikipedia.

FAQ: City of Pullman WA Re-Piping & Plumbing Code

Q1: Can I re-pipe my house myself in Pullman, WA?

Yes, but only if you’re the owner-occupant and live in the home. You must still pull a permit, follow all code requirements, and pass inspections. However, complex jobs (e.g., main sewer replacement) often require licensed professionals due to technical precision.

Q2: How long does the re-piping inspection process take?

Typically 2–5 business days after you schedule. The rough-in and final inspections are separate, so allow at least one week between phases. Delays occur if corrections are needed.

Q3: What happens if I fail the inspection?

You’ll receive a correction notice listing deficiencies. You can re-schedule inspection after fixes—usually with a $75 re-inspection fee. Three consecutive failures may require third-party engineering review.

Q4: Are PEX pipes allowed in Pullman?

Yes! PEX-A and PEX-B are fully approved for residential water supply under WSPC 604.12, as long as they’re NSF-certified and installed per manufacturer guidelines (e.g., no UV exposure, proper expansion fittings).

Q5: Do I need a backflow preventer for my garden hose?

Yes. The City of Pullman requires a hose-bib vacuum breaker (HBVB) on every outdoor spigot to prevent contaminated water from siphoning back into your home’s supply—per WSPC 209.0 and EPA guidelines.

Q6: Where can I get the official re-piping checklist?

Download the Pullman Plumbing Inspection Checklist directly from the City’s Building Division page or request it in person at City Hall (220 SE Bayard St).

Conclusion

Navigating the City of Pullman WA re-piping inspection checklist doesn’t have to be stressful. With the right planning, approved materials, and timely inspections, your project can pass smoothly—saving you time, money, and headaches. Remember: compliance isn’t just about rules; it’s about protecting your home’s health, safety, and value.

✅ Take action today: Bookmark this guide, download Pullman’s official checklist, and consult a licensed plumber if you’re unsure.

Found this helpful? Share it with a friend in Whitman County who’s planning a home upgrade! 👷‍♂️💧

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